Commit d7b7e580 authored by Kevin Wolf's avatar Kevin Wolf
Browse files

ide-test: Check what happens with bus mastering disabled 



The main goal is that qemu doesn't crash.

Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent e85d9db5

tests/ide-test.c

+26 −0
Original line number Diff line number Diff line
@@ -81,6 +81,7 @@ enum { 
    CMD_IDENTIFY    = 0xec,



    CMDF_ABORT      = 0x100,

    CMDF_NO_BM      = 0x200,

};



enum {
@@ -192,6 +193,11 @@ static int send_dma_request(int cmd, uint64_t sector, int nb_sectors, 
        g_assert_not_reached();

    }



    if (flags & CMDF_NO_BM) {

        qpci_config_writew(dev, PCI_COMMAND,

                           PCI_COMMAND_IO | PCI_COMMAND_MEMORY);

    }



    /* Select device 0 */

    outb(IDE_BASE + reg_device, 0 | LBA);
@@ -352,6 +358,25 @@ static void test_bmdma_long_prdt(void) 
    assert_bit_clear(inb(IDE_BASE + reg_status), DF | ERR);

}



static void test_bmdma_no_busmaster(void)

{

    uint8_t status;



    /* No PRDT_EOT, each entry addr 0/size 64k, and in theory qemu shouldn't be

     * able to access it anyway because the Bus Master bit in the PCI command

     * register isn't set. This is complete nonsense, but it used to be pretty

     * good at confusing and occasionally crashing qemu. */

    PrdtEntry prdt[4096] = { };



    status = send_dma_request(CMD_READ_DMA | CMDF_NO_BM, 0, 512,

                              prdt, ARRAY_SIZE(prdt));



    /* Not entirely clear what the expected result is, but this is what we get

     * in practice. At least we want to be aware of any changes. */

    g_assert_cmphex(status, ==, BM_STS_ACTIVE | BM_STS_INTR);

    assert_bit_clear(inb(IDE_BASE + reg_status), DF | ERR);

}



static void test_bmdma_setup(void)

{

    ide_test_start(
@@ -493,6 +518,7 @@ int main(int argc, char **argv) 
    qtest_add_func("/ide/bmdma/simple_rw", test_bmdma_simple_rw);

    qtest_add_func("/ide/bmdma/short_prdt", test_bmdma_short_prdt);

    qtest_add_func("/ide/bmdma/long_prdt", test_bmdma_long_prdt);

    qtest_add_func("/ide/bmdma/no_busmaster", test_bmdma_no_busmaster);

    qtest_add_func("/ide/bmdma/teardown", test_bmdma_teardown);



    qtest_add_func("/ide/flush", test_flush);